Phonograph



G. B. BURCH.

PHONOGRAPH.

APPLICATION FILED JUNE 12, 1918. RENEWED AUG. 2, 1921.

Patented May 2, 11922.

2 SHEETSSHEET ikil'l...

5 m-vewfoz e. B. BURCH.

PHONOGRAPH.

APPLICATION FILED JUNE 12, I918- RENEWED AUG- 2,1921- SQQU j fig g gg Patented. May 2, 1922.

2 SHEETS-SHEET 2.

' UNITED STATES GEORGE B. BURCH, 01' NEW YORK, N. Y.,

ASBIGNOB 1'0 LESLIE STEVENS, OI GLEN RIDGE, NEW JERSEY.

PHONOGRAPH.

Specification of Letters Patent.

Patented May 2, 1922.

Application filed June 12, 1918, Serial No. 289,588. Renewed August 2, 1821. ,flerlel No. 488,200.

- To all whom it may concern."

Be it known that I, Gnonon B. BURCH, a

of the city of New York, county of Kings, and State of New York, have invented a new and useful Improvement in Phonoaphs, of which the following is a specllication. v

The object of my invention is to provide a phonographic apparatus which requires no amplifying horn and which is eflicient 1n operation and accurately reproduces all sounds recorded in the record and yet is simple in construction and efficient in operation. These and other objects are accomplished by my invention, one embodiment of which is hereinafter more particularly set forth.

For a more particular description of my invention reference is to be had to the accompanying' drawings forming a part hereof in which:

Figure 1 is a sectional view of my instrument. 1 I

Figure 2 is a sectional view'showmg the stylus holder, transmission rod' and connecte arts. 1

, igure 3 is a sectional view-taken on th line 33 ofFigure 2, looking in the direction of the arrows. c v

Figure 4 is a sectional view showing the lower part of the. structure shown in Figure 2, the section being taken at right angles to that of Figure 2.

- Figure 5 is a sectional view showing a portion of the diaphragm and a portion of the rim on which it is mounted.

Fi ure 6' shows a portion of the edge of the (fiaphragm.

Figure 7 's a sectional view showing a slightly modified construction in and about the stylus holder.

Throughout the various views of thedrawings,,similar reference characters designate similar parts. I

My improved phonograph 1 is provided with a suitable casing 2 in which is mounted p the usual motor 3 and from whlch uses avertical spindle 4 which carries the conventional turn table 5 which supports the record 6 in the usual manner. At one side of the turn table, and on the case 2, is mounted a bracket? which contains a pivot 8 at the upper end of which is a suitable hinge 9 which is fixed to the edge of the diaphragm structure which in turn is fixed to the rim 11 by glue or any other suitable means.

The diaphragm 10 is preferably made somewhat convex or of outwardly bulging form as indicated in Figure 1 in which it is shown as provided with additional layers 12 and '13 at its center which layers are secured to the main portion so that all layers constitute what is practically one integral means with a stifi'ened center. At the center of the diaphragm 10 is fixed one end of a transmission rod 14 which is shown as enclosed throughout the greater part of its len th in a' suitable tube 15 and itv extends su stantially straight from the diaphragm to a point adjacent to but laterally'oflset' from the axis of oscillation of the stylusholder, its lower end bein .fixed in a lug 16 of the stylus holder 17 he stylus holder 17, which carries a stylus 18 in any suitable manner, has laterally extending arms with centers which receive set screws 19 which are referably provided with lock nuts 20. hese set screws may be mounted in the lower end of the tube 15, as shown in Figures 2, 3 and 4, or they may be mounted in a suitable hollow ti piece 21 which is screw threaded into the ower end of the tube 15 as shown in Figure 7.' In any event the laterally extending portions of-the stylus holder 17 which receive the screws 19 extend at right angles to the In 16 as shown in Figure 3 or at substantial y a right angle so that all in the surrounding atmosphere. Because of the relatively great length and slenderness and resulting flexibility of the transmission rod, the vibrations of the stylus holder imarted to the rod through the lug 16 are transmitted to the diaphragm in the direction of the len th of the rod. By using a flexible rod an connecting it rigidly to the stiylus holder and diaphragm, the possibility 0 lost motion due to pivot pin connections is avoided.

In the preferred embodiment of my invention a number of weakening perforations 22 areplaced as shown in Figures 5 and 6 near the rim 11 so as to make the material more flexible at this point and avoid damping of the vibrations'of the diaphragm. To further promote this flexibility it is desirable that a bead 23 should be placed over the rim 11.

The rim v11 may be made in any of several ways but in the preferred embodiment of my invention it is made with sufiicient thickness to be stiff and have countersunk holes through which are passed long screws or spokes 24 which are entered into a suitable hub 25 so as to hold the rim ll true with regard to the hub and the hub is mounted with a tight sliding fit on the tube 15 so that if desired, this tube may be twisted through an angle of substantially ninet degrees so that the instrument may use elther records with a groove of irregular depth or records with a thread with irregular sides, as desired. The instrument shown is suitable for a record 6 with a thread of irregular sides, that is, a laterally cut record but by turning the tube 15 I through an angle of ninety degrees, the instrument can be made suitable for a record with a groove of irregular depth. In any event the proper sound vibrations are transmitted through the stylus 18, stylus holder 17 and transmission rod l tto the diaphragm 10 as above described so that this diaphragm will generate suitable sound waves directly in the surrounding air without theaid of any amplifying horn or other similar device.

While I have shown and described one embodiment of my invention, it is obvious that it is not restricted thereto and that it is broad enough to cover all structures that come Within the scope of my invention.

Having thus described my invention, what I claim is? i v '1.' Phonograph apparatus comprising in combination with an outwardly bhlging, large, direct-acting diaphragm, supportin means providing an edge support for the diaphragm andsupporting axially of the diaphragm a stylus holder, a stylus holder mounted in said supporting means to be capable of vibratory oscillation, and a flexible transmission rod connected to the stylusholder and to the diaphragm, said rod extending substantially straight from the diaphragm to a point adjacent but laterally ofi'set from the axis of oscillation of the stylus holder. I

2. Phonograph apparatus comprising in combination with an outwardly bulging. large, direct-acting diaphragm, supporting means providing an edge support for the diaphragm and supporting axially of the diaphragm a stylus holder, a stylus holder mounted in said supporting means to be capable of vibratory oscillation, and a flexible transmission rod connected to the stvlus holder and to the diaphragm, said rod be ing connected to the stylus holder at a point adjacent to but laterally offset from its axis oi. oscillation.

3. Phonograph apparatus, comprising in combination with an outwardly, bulging, large, direct-acting diaphragm, supporting means providing an edge support for the diaphragm and supporting axially of the diaphragm a stylus holder, a rigid stylus holder mounted in said supporting means to be capable of vibratory oscillation, and a transmission rod connected to the stylus holder and to the diaphragm, said rod being tiexible and being rigidly connected to the diaphragm and rigidly connected to the stylus holder at a point adjacent to but lat erally offset from its axis of oscillation.

GEORGE E. BURCH. 

